package ee.kuli.hk.rent;

/*
* Copyright 2009 ZXing authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*      http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/


import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.ActivityNotFoundException;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.net.Uri;
import android.util.Log;

/**
* <p>A utility class which helps ease integration with Barcode Scanner via {@link Intent}s. This is a simple
* way to invoke barcode scanning and receive the result, without any need to integrate, modify, or learn the
* project's source code.</p>
*
* <h2>Initiating a barcode scan</h2>
*
* <p>To integrate, create an instance of {@code IntentIntegrator} and call {@link #initiateScan()} and wait
* for the result in your app.</p>
*
* <p>It does require that the Barcode Scanner (or work-alike) application is installed. The
* {@link #initiateScan()} method will prompt the user to download the application, if needed.</p>
*
* <p>There are a few steps to using this integration. First, your {@link Activity} must implement
* the method {@link Activity#onActivityResult(int, int, Intent)} and include a line of code like this:</p>
*
* <pre>{@code
* public void onActivityResult(int requestCode, int resultCode, Intent intent) {
*   IntentResult scanResult = IntentIntegrator.parseActivityResult(requestCode, resultCode, intent);
*   if (scanResult != null) {
*     // handle scan result
*   }
*   // else continue with any other code you need in the method
*   ...
* }
* }</pre>
*
* <p>This is where you will handle a scan result.</p>
*
* <p>Second, just call this in response to a user action somewhere to begin the scan process:</p>
*
* <pre>{@code
* IntentIntegrator integrator = new IntentIntegrator(yourActivity);
* integrator.initiateScan();
* }</pre>
*
* <p>Note that {@link #initiateScan()} returns an {@link AlertDialog} which is non-null if the
* user was prompted to download the application. This lets the calling app potentially manage the dialog.
* In particular, ideally, the app dismisses the dialog if it's still active in its {@link Activity#onPause()}
* method.</p>
* 
* <p>You can use {@link #setTitle(String)} to customize the title of this download prompt dialog (or, use
* {@link #setTitleByID(int)} to set the title by string resource ID.) Likewise, the prompt message, and
* yes/no button labels can be changed.</p>
* 
* <p>By default, this will only allow applications that are known to respond to this intent correctly
* do so. The apps that are allowed to response can be set with {@link #setTargetApplications(Collection)}.
* For example, set to {@link #TARGET_BARCODE_SCANNER_ONLY} to only target the Barcode Scanner app itself.</p>
*
* <h2>Sharing text via barcode</h2>
*
* <p>To share text, encoded as a QR Code on-screen, similarly, see {@link #shareText(CharSequence)}.</p>
*
* <p>Some code, particularly download integration, was contributed from the Anobiit application.</p>
*
* @author Sean Owen
* @author Fred Lin
* @author Isaac Potoczny-Jones
* @author Brad Drehmer
* @author gcstang
*/
public final class IntentIntegrator {

 public static final int REQUEST_CODE = 0x0000c0de; // Only use bottom 16 bits
 private static final String TAG = IntentIntegrator.class.getSimpleName();

 public static final String DEFAULT_TITLE = "Install Barcode Scanner?";
 public static final String DEFAULT_MESSAGE =
     "This application requires Barcode Scanner. Would you like to install it?";
 public static final String DEFAULT_YES = "Yes";
 public static final String DEFAULT_NO = "No";

 private static final String BS_PACKAGE = "com.google.zxing.client.android";

 // supported barcode formats
 public static final Collection<String> PRODUCT_CODE_TYPES = list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "RSS_14");
 public static final Collection<String> ONE_D_CODE_TYPES =
     list("UPC_A", "UPC_E", "EAN_8", "EAN_13", "CODE_39", "CODE_93", "CODE_128",
          "ITF", "RSS_14", "RSS_EXPANDED");
 public static final Collection<String> QR_CODE_TYPES = Collections.singleton("QR_CODE");
 public static final Collection<String> DATA_MATRIX_TYPES = Collections.singleton("DATA_MATRIX");

 public static final Collection<String> ALL_CODE_TYPES = null;
 
 public static final Collection<String> TARGET_BARCODE_SCANNER_ONLY = Collections.singleton(BS_PACKAGE);
 public static final Collection<String> TARGET_ALL_KNOWN = list(
         BS_PACKAGE, // Barcode Scanner
         "com.srowen.bs.android", // Barcode Scanner+
         "com.srowen.bs.android.simple" // Barcode Scanner+ Simple
         // TODO add more -- what else supports this intent?
     );
 
 private final Activity activity;
 private String title;
 private String message;
 private String buttonYes;
 private String buttonNo;
 private Collection<String> targetApplications;
 
 public IntentIntegrator(Activity activity) {
   this.activity = activity;
   title = DEFAULT_TITLE;
   message = DEFAULT_MESSAGE;
   buttonYes = DEFAULT_YES;
   buttonNo = DEFAULT_NO;
   targetApplications = TARGET_ALL_KNOWN;
 }
 
 public String getTitle() {
   return title;
 }
 
 public void setTitle(String title) {
   this.title = title;
 }

 public void setTitleByID(int titleID) {
   title = activity.getString(titleID);
 }

 public String getMessage() {
   return message;
 }

 public void setMessage(String message) {
   this.message = message;
 }

 public void setMessageByID(int messageID) {
   message = activity.getString(messageID);
 }

 public String getButtonYes() {
   return buttonYes;
 }

 public void setButtonYes(String buttonYes) {
   this.buttonYes = buttonYes;
 }

 public void setButtonYesByID(int buttonYesID) {
   buttonYes = activity.getString(buttonYesID);
 }

 public String getButtonNo() {
   return buttonNo;
 }

 public void setButtonNo(String buttonNo) {
   this.buttonNo = buttonNo;
 }

 public void setButtonNoByID(int buttonNoID) {
   buttonNo = activity.getString(buttonNoID);
 }
 
 public Collection<String> getTargetApplications() {
   return targetApplications;
 }
 
 public void setTargetApplications(Collection<String> targetApplications) {
   this.targetApplications = targetApplications;
 }
 
 public void setSingleTargetApplication(String targetApplication) {
   this.targetApplications = Collections.singleton(targetApplication);
 }

 /**
  * Initiates a scan for all known barcode types.
  */
 public AlertDialog initiateScan() {
   return initiateScan(ALL_CODE_TYPES);
 }

 /**
  * Initiates a scan only for a certain set of barcode types, given as strings corresponding
  * to their names in ZXing's {@code BarcodeFormat} class like "UPC_A". You can supply constants
  * like {@link #PRODUCT_CODE_TYPES} for example.
  */
 public AlertDialog initiateScan(Collection<String> desiredBarcodeFormats) {
   Intent intentScan = new Intent(BS_PACKAGE + ".SCAN");
   intentScan.addCategory(Intent.CATEGORY_DEFAULT);

   // check which types of codes to scan for
   if (desiredBarcodeFormats != null) {
     // set the desired barcode types
     StringBuilder joinedByComma = new StringBuilder();
     for (String format : desiredBarcodeFormats) {
       if (joinedByComma.length() > 0) {
         joinedByComma.append(',');
       }
       joinedByComma.append(format);
     }
     intentScan.putExtra("SCAN_FORMATS", joinedByComma.toString());
   }

   String targetAppPackage = findTargetAppPackage(intentScan);
   if (targetAppPackage == null) {
     return showDownloadDialog();
   }
   intentScan.setPackage(targetAppPackage);
   intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
   intentScan.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
   activity.startActivityForResult(intentScan, REQUEST_CODE);
   return null;
 }
 
 private String findTargetAppPackage(Intent intent) {
   PackageManager pm = activity.getPackageManager();
   List<ResolveInfo> availableApps = pm.queryIntentActivities(intent, PackageManager.MATCH_DEFAULT_ONLY);
   if (availableApps != null) {
     for (ResolveInfo availableApp : availableApps) {
       String packageName = availableApp.activityInfo.packageName;
       if (targetApplications.contains(packageName)) {
         return packageName;
       }
     }
   }
   return null;
 }

 private AlertDialog showDownloadDialog() {
   AlertDialog.Builder downloadDialog = new AlertDialog.Builder(activity);
   downloadDialog.setTitle(title);
   downloadDialog.setMessage(message);
   downloadDialog.setPositiveButton(buttonYes, new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialogInterface, int i) {
       Uri uri = Uri.parse("market://details?id=" + BS_PACKAGE);
       Intent intent = new Intent(Intent.ACTION_VIEW, uri);
       try {
         activity.startActivity(intent);
       } catch (ActivityNotFoundException anfe) {
         // Hmm, market is not installed
         Log.w(TAG, "Android Market is not installed; cannot install Barcode Scanner");
       }
     }
   });
   downloadDialog.setNegativeButton(buttonNo, new DialogInterface.OnClickListener() {
     @Override
     public void onClick(DialogInterface dialogInterface, int i) {}
   });
   return downloadDialog.show();
 }


 /**
  * <p>Call this from your {@link Activity}'s
  * {@link Activity#onActivityResult(int, int, Intent)} method.</p>
  *
  * @return null if the event handled here was not related to this class, or
  *  else an {@link IntentResult} containing the result of the scan. If the user cancelled scanning,
  *  the fields will be null.
  */
 public static IntentResult parseActivityResult(int requestCode, int resultCode, Intent intent) {
   if (requestCode == REQUEST_CODE) {
     if (resultCode == Activity.RESULT_OK) {
       String contents = intent.getStringExtra("SCAN_RESULT");
       String formatName = intent.getStringExtra("SCAN_RESULT_FORMAT");
       byte[] rawBytes = intent.getByteArrayExtra("SCAN_RESULT_BYTES");
       int intentOrientation = intent.getIntExtra("SCAN_RESULT_ORIENTATION", Integer.MIN_VALUE);
       Integer orientation = intentOrientation == Integer.MIN_VALUE ? null : intentOrientation;
       String errorCorrectionLevel = intent.getStringExtra("SCAN_RESULT_ERROR_CORRECTION_LEVEL");
       return new IntentResult(contents,
                               formatName,
                               rawBytes,
                               orientation,
                               errorCorrectionLevel);
     }
     return new IntentResult();
   }
   return null;
 }


 /**
  * Shares the given text by encoding it as a barcode, such that another user can
  * scan the text off the screen of the device.
  *
  * @param text the text string to encode as a barcode
  */
 public void shareText(CharSequence text) {
   Intent intent = new Intent();
   intent.addCategory(Intent.CATEGORY_DEFAULT);
   intent.setAction(BS_PACKAGE + ".ENCODE");
   intent.putExtra("ENCODE_TYPE", "TEXT_TYPE");
   intent.putExtra("ENCODE_DATA", text);
   String targetAppPackage = findTargetAppPackage(intent);
   if (targetAppPackage == null) {
     showDownloadDialog();
   } else {
     intent.setPackage(targetAppPackage);
     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
     intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
     activity.startActivity(intent);
   }
 }
 
 private static Collection<String> list(String... values) {
   return Collections.unmodifiableCollection(Arrays.asList(values));
 }

}